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authorEero Nurkkala <ext-eero.nurkkala@nokia.com>2009-08-20 16:18:20 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-08-20 20:10:28 +0100
commit72cc6d715d5b018e2cff4adb68966855850d4e77 (patch)
tree1de489136f247a7476dbec72759cb51311dafa86
parentfa3935ba34667ffd35fbb33958cd1d67035fdf82 (diff)
downloadlinux-linaro-precise-72cc6d715d5b018e2cff4adb68966855850d4e77.tar.gz
OMAP: McBSP: Let element DMA mode hit retention also
The device no longer hits retention if element DMA mode is taken for at least the duration of the serial console timeout. Force element DMA mode to shut down through smartidle. Signed-off-by: Eero Nurkkala <ext-eero.nurkkala@nokia.com> Acked-by: Eduardo Valentin <eduardo.valentin@nokia.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
-rw-r--r--arch/arm/plat-omap/mcbsp.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 56a56887ded..b63a7209b41 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -343,6 +343,15 @@ static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp)
syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03) | CLOCKACTIVITY(0x03));
+ /*
+ * HW bug workaround - If no_idle mode is taken, we need to
+ * go to smart_idle before going to always_idle, or the
+ * device will not hit retention anymore.
+ */
+ syscon |= SIDLEMODE(0x02);
+ OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
+
+ syscon &= ~(SIDLEMODE(0x03));
OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN, 0);